This is a summary of the article. "Computer Network Principles and Applications" (Tsinghua University Press) the main contents of this article are from.
1. Important dates:
1.1946 years, the first electronic computer ENIAC was born. 2.1963 years, the MIT Lincoln Laboratory as SAGE air defense system, is a combination of computer technology and communication technology pioneer. 3. In 1968, the completion of the ARPAnet was switched computer network system having a network structure. Proposed store and forward mode of operation.
2. Computer Networks:
Definition: dispersed in different geographical multiple computers with active processing capability via the transmission medium and the communication device each connected together in a network operating system and network communication software to control the, according to a uniform protocol for collaborative work , to achieve resource shared computer system purposes.
Simply put characteristic is the connection protocol to share.
3. Development of computer networks:
1. First generation (1950): In the center of a single computer for the terminal ① a remote connection system. Such a system would computer technology and communication technology, constitutes the prototype of the computer network (although it can not be a computer network). Structured as follows:
N. term:
① (Network) terminal: the terminal equipment is also known, is a computer network in the most peripheral network devices, mainly for inputting and outputting the processing result of the user information and the like. In earlier computer systems, since the host computer is expensive, a host (IBM mainframe computers) typically arranged plurality of terminals, which itself does not have the computing power, bear only operation information input and output, and the arithmetic processing is done by the host . Modern input and output terminals can afford only work, but also to perform certain operations and processing, part of the system function. - Excerpt from the Baidu Encyclopedia
①②③④⑤⑥⑦⑧⑨⑩